import java.io.File;

public class TestDemo5 {
    public static void main(String[] args) {
        //在当前项目底下创建一个 aaa 目录
        File file = new File("./aaa/bbb/ccc");
        System.out.println(file.isDirectory());
        file.mkdirs();
        System.out.println(file.isDirectory());
    }
}
